In the science museum three large, well-lighted rooms on the second floor will be used for collections in zoölogy, botany, and mineralogy. "The closely allied branches of geology, the study of the earth's crust; paleontology, the study of life in former ages; anthropology, the natural history of the human species; archæology, the science of antiquity; and ethnology and ethnography, treating of the origin, relation, characteristic costumes and habits of the human races, will, no doubt, receive as much attention as space and funds will permit." It is also expected that works of skill and invention will be gathered into an industrial museum for the benefit especially of the many artisans of Pittsburg. Courses of free lectures will be given to teachers, to pupils, and to the public, as in the American Museum of Natural History of New York. Below the three rooms in the museum are three lecture-rooms, which can be used separately or as one room. In one end of the large library building, and separated from it by a thick wall so as to deaden sound, is the music-hall, semi-circular in plan, with seats for two thousand one hundred persons, and a stage for sixty musicians and a chorus of two hundred. Much Sienna marble is used, the floor is mosaic, the walls are painted a deep rose-color, and the architecture proper in a soft ivory tone, with gilded ornamentation. Two free concerts, or organ recitals, are given each week through the year, on the large modern concert organ, built expressly for this hall. Musical lectures are also given, free from technicalities, illustrated by choir, organ, and piano. This is certainly taking music, art, and science to the people as a free gift. To this noble work Mr. Carnegie has given $2,100,000. Of this amount, $800,000 was for the main building, $300,000 for the seven branch libraries or distributing stations, and $1,000,000 as an endowment fund for the art-gallery. From the annual income of this art-fund, which will be about $50,000, at least three of the pictures purchased are to be the work of American artists exhibited that year, preferably in the Pittsburg gallery.